Pressure roll loading

ABSTRACT

In a single facer, the roll for applying pressure to the liner web forcing it against the glue containing flute tips of the corrugated web is moved between operating and retracted positions by double acting power cylinder means operated by relatively high pressure fluid. When the pressure roll reaches its operating position, it operates a control valve to automatically control application of an opposing pressure, at lower than said high pressure, to the double acting cylinder means so that the net force maintaining the pressure roll in its operating position is derived from the net value of the high and opposing pressures.

United States Patent 91 Volkers [111 3,707,909 1 1 Jan.2,1973

[541 PRESSURE ROLL LOADING [75] lnventor: Hank Volkers, Aalsmeer, Netherlands [73] Assignee: S & S Corrugated Paper Machinery Co., Inc., Brooklyn, N.Y.

[22] Filed: Aug. 13, 1971 [21] Appl. No.: 171,619

52 us. C1. ..100/41, 100/168, 100/170, 1 156/473 51 Int. Cl. ..B30b 15/14, B30b 3/04- [58] Field of Search ..l00/47, 155, 160,162, 168, 100/170, 176; 156/473 [56] References Cited UNITED STATES PATENTS 1,100,065 6/1914 Ferres ..156/473 2,404,946 7/1946 Clem ..100/168 X Bruker ..l56/473 2,710,044 6/1955 3,390,040 6/1968 Moser et a1 ..156/473 3,445,070 5/1969 Verdier ..100/170 X Primary ExaminerPeter Feldman Attorney-Sidney G. Faber et a1.

[57] ABSTRACT In a single facer, the roll for applying pressure to the liner web forcing it against the glue containing flute tips of the corrugated web is moved between operating and retracted positions by double acting power cylinder means operated by relatively high pressure fluid. When the pressure roll reaches its operating position, it operates a control valve to automatically control application of an opposing pressure, at lower than said high pressure, to the double acting cylinder means so that the net force maintaining the pressure roll in its operating position is derived from the net value of the high and opposing pressures.

6 Claims, 2 Drawing Figures PRESSURE ROLL LOADING This invention relates to apparatus for producing corrugated paper board in general and more particularly relates to fluid pressure means for moving and loading the pressure roll that acts on the liner web.

In the production of single face corrugated board, a web of paper is passed between a pair of cooperating corrugations rolls which apply transverse corrugations to this web. Glue is then applied to the flute tips of the corrugations, and shortly thereafter a liner web is joined to the glue coated flute tips. A pressure roll acting on the liner sheet urges the latter into firm engagement with the glue bearing flute tips, while the corrugated web is still in engagement with one of the corrugating rolls.

In order to permit the corrugated and flat webs to be threaded between the pressure roll and the corrugated roll adjacent thereto, and also to permit idling the machine without paper, it is necessary for the pressure roll to be mounted for limited movement transverse to its rotational axis, toward nd away from the last noted corrugated roll. In accordance with the instant invention, this movement of the pressure roll is effected by means of a pair of double acting cylinders connected to opposite ends of the pressure roll. As will hereinafter be seen, high pressure is used to move the pressure roll into and out of operating position, and when the pressure roll is in its operating position a control valve is operated to automatically apply an opposing regulated fluid pressure to the double acting cylinder means to partially offset the effects of the relatively high pressure which moves the pressure roll into operating position.

Accordingly, a primary object of the instant invention is to provide a novel means for moving a pressure roll and maintaining it in operating position.

Another object is to provide means of this type which utilizes double acting fluid pressure cylinder means.

A further object is to provide apparatus of this type in which differential pressure is utilized to derive the force maintaining the pressure roll in its operative position.

A still further object is to provide apparatus of this type which roll pressure may be readily adjusted.

These objects as well as other objects of this invention will become readily apparent after reading the following description of the accompanying drawings in which:

FIG. 1 is a side elevation of a single facer including pressure roll moving and loading means constructed in accordance with teachings of the instant invention.

FIG. 2 is a schematic of the fluid operating system for the double acting fluid power cylinder means which operates the pressure roll.

Now referring to the Figures. For purposes of describing the instant invention, only a very brief description of single facer is included herein. A more detailed description of single facer 10 is found in the A. F. Shields U.S. Pat. No. 2,711,206 issued June 21, 1955. That is, single facer 10 includes a pair of cooperating driven elongated corrugated rolls ll, 12, having the ends thereof supported by transversely spaced frame members 14. Web 15, after passing between corrugating rolls ll, 12, continues in a clockwise direction about corrugating roll 12 past glue roll 16 which applies glue to the flute tips of corrugations formed in web 15.

Web 15 then moves past pressure roll 17 where liner web 18 is forced against the glue bearing flute tips of corrugated web portion 15a to produce single face corrugated board 20.

Each end of pressure roll 17 is rotably mounted in bearing means 21 for rotation about longitudinal axis 22. Bearing means 21 is fixedly mounted in an eccentric position to circular carrier 23 that is pivotally mounted to frame 14. The center of rotation for carrier 23 is indicated by reference numeral 24. Crank arm 26, fixedly secured to carrier 23 and extending radially therefrom, is secured by pin 27 to the free end of arm 28 connected to movable piston 29 within cylinder 31 of double acting fluid operated power cylinder 30. Pins 32, extending in opposite directions from the side of cylinder 31, pivotally mount power cylinder 30 between brackets 33 connected to the left side of frame 14. Two-way fluid control 35, mounted to frame 14, includes operating extension 36 engageable by element 37 secured to carrier 23 and projecting therefrom.

In FIG. 1 pressure roll 17 is shown in its operating position adjacent to corrugating roll 12. For various reasons well known to the art, it often becomes necessary to move pressure roll 17 to a position remote from corrugating roll 12. This is accomplished by operating piston 27 to the rear, or left of the position illustrated in FIG. 1. This pivots carrier 23 in a counterclockwise direction and disengages member 37 from control extension 36. This disengagement permits control 35 to return to its normal position illustrated in FIG. 2, wherein control 35 connects input 41 of shuttle valve 40 to ambient pressure through quick exhaust valve 45. When control 35 is in the actuated position of FIG. 1, shuttle valve input 41 is connected to the output of relatively low fluid pressure regulator 46. The input of regulator 46 is fed with relatively high unregulated fluid pressure in line 66.

Output 43 of shuttle valve 40 is connected to the interior of cylinder 31 forward of piston 29 and the other input 42 of shuttle valve 40 is connected through line 48 to three-way control valve 50. In the position shown in FIG. 2, control 50 connects quick exhaust valve 61 through lines 62 and 63 to the interior of cylinder 31 at the rear of piston 29 and connects line 48 to the output of relatively high pressure regulator 65.

Thus, with control valves 35 and 50 in the positions shown in FIG. 2, ambient pressure is at the rear of piston 29 and relatively high pressure is at the front thereof. The latter condition is a result of the fact that shuttle valve 40 is so constructed that the pressure appearing at output 43 thereof is the higher of the two pressures appearing at inputs 41, 42. In this case relatively high pressure appears at input 42 so that relatively high pressure is acting at the front of piston 29 driving it rearward to retract roll 17 from the position shown in FIG. 1.

To move pressure roll 17 toward its operating position, control valve 50 is operated to the position not shown in FIG. 2 in which line 62 is connected to relatively high fluid pressure and pressure is removed from line 48. Thus, piston 29 moves forward, pivoting carrier 23 clockwise, thereby moving pressure roll 17 forward to its operative position. By the time pressure roll 17 reaches its operative position of FIG. 1, member 37 engages extension 36 and operates control 35 to its position not shown in FIG. 2, wherein relatively low pressure is applied to shuttle valve input 41. At this time the higher of the pressures appearing at shuttle valve inputs 41, 42 is a relatively low pressure provided by adjustable fluid pressure regulator 46 so that this relatively low pressure appears at output 43 and is applied at the front of piston 29 to act in opposition to the relatively high pressure provided at the rear of piston 29 by adjustable fluid pressure regulator 65. Thus, pressure roll 17 is held in its operative position by the net force acting on piston 29, with this force being derived from the relatively high pressure of regulator 65 opposed by the relatively low pressure of regulator 46.

Double acting power cylinder 30 acts on one end of pressure roll 17 and an identical double acting power cylinder 30' acts on the other end of pressure roll 17. Since the operating elements for controlling power cylinders 30 and 30' are identical, these operating elements for the latter will not be described but will merely be noted. That is, elements 35 40' 45' and 46' for the operation of double acting power cylinder 30 are identical to the respective elements 35, 40, 45, 46 and operate essentially at the same time as the respective elements.

Thus, it is seen that the instant invention provides novel fluid pressure operated means for fast movement of a pressure roll and application of readily adjustable differential pressure means to maintain the pressure roll in its operative position.

Although in the foregoing this invention has been described in connection with preferred embodiments, many modifications will now become apparent to those skilled in the art, and it is therefore preferred that this invention be limited not by the foregoing description but only by the appending claims.

The embodiments of the invention in which an exclusive privilege or property is claimed are defined as follows.

1. Apparatus including first and second elongated rolls for acting upon elongated web means moving therebetween; said rolls being mounted for rotation on parallel axes; fluid operated means or moving said first roll relative to said second roll, transverse to the axes thereof, between a retracted position remote from said second roll and an operating position forward of said retracted position and adjacent to said second roller; said fluid operating means including double acting power cylinder means having a movable member connected to said first roll for moving the latter and maintaining it in said operating position; means for supplyingfluid at first and second pressure levels with said first pressure level being above said second pressure level; a first control means operable between a first and a second position; said first control means when in said first position introducing fluid at said first pressure level to the rear of said movable member, thereby moving the latter forward to move said first roll forward at relatively high speed; said first control means when in said second position introducing fluid at said first pressure level to the front of said movable member thereby moving the latter rearward to move said first roll to its retracted position; a second control means operable from a normal first to a second position by said first roll as the latter reaches a predetermined position in moving toward itsoperating position; saidsecond control means when in its sai second position introducing fluid at said second pressure level to the front of said movable member whereby said first roll is maintained in its operating position by forces derived from the net effect of fluid at said second pressure level acting in opposition to fluid at said first pressure level.

2. Apparatus as set forth in claim 1 in which'said double acting power cylinder means includes first and second sections acting essentially in unison and connected to said second roll at opposite ends thereof.

3. Apparatus as set forth in claim 1 in which there is a third valve means interposed between the front of said movable member and both said first and said second control means; said third control means including a first input connected to said first control means, a

. second input connected to said second control means,

an output connected to said double acting power cylinder means in front of said movable member, and means which automatically connects said output to the one of said first and second input at which a higher pressure level is present.

4. Apparatus as set forth in claim 3 in which said first control means when in its said second position connecting the rear of said movable member to ambient.

5. Apparatus as set forth in claim 4 in which said second control means when in its said first position connecting the front of said movable member to ambient.

'6. Apparatus as set forth in claim 5 in which said double acting power cylinder means includes first and second sections acting essentially in unison and connected to said second roll at opposite ends thereof. 

1. Apparatus including first and second elongated rolls for acting upon elongated web means moving therebetween; said rolls being mounted for rotation on parallel axes; fluid operated means or moving said first roll relative to said second roll, transverse to the axes thereof, between a retracted position remote from said second roll and an operating position forward of said retracted position and adjacent to said second roller; said fluid operating means including double acting power cylinder means having a movable member connected to said first roll for moving the latter and maintaining it in said operating position; means for supplying fluid at first and second pressure levels with said first pressure level being above said second pressure level; a first control means operable between a first and a second position; said first control means when in said first position introducing fluid at said first pressure level to the rear of said movable member, thereby moving the latter forward to move said first roll forward at relatively high speed; said first control means when in said second position introducing fluid at said first pressure level to the front of said movable member thereby moving the latter rearward to move said first roll to its retracted position; a second control means operable from a normal first to a second position by said first roll as the latter reaches a predetermined position in moving toward its operating position; said second control means when in its said second position introducing fluid at said second pressure level to the front of said movable member whereby said first roll is maintained in its operating position by forces derived from the net effect of fluid at said second pressure level acting in opposition to fluid at said first pressure level.
 2. Apparatus as set forth in claim 1 in which said double acting power cylinder means includes first and second sections acting essentially in unison and connected to said second roll at opposite ends thereof.
 3. ApParatus as set forth in claim 1 in which there is a third valve means interposed between the front of said movable member and both said first and said second control means; said third control means including a first input connected to said first control means, a second input connected to said second control means, an output connected to said double acting power cylinder means in front of said movable member, and means which automatically connects said output to the one of said first and second input at which a higher pressure level is present.
 4. Apparatus as set forth in claim 3 in which said first control means when in its said second position connecting the rear of said movable member to ambient.
 5. Apparatus as set forth in claim 4 in which said second control means when in its said first position connecting the front of said movable member to ambient.
 6. Apparatus as set forth in claim 5 in which said double acting power cylinder means includes first and second sections acting essentially in unison and connected to said second roll at opposite ends thereof. 